U.S.-listed shares of China-based e-commerce platforms Alibaba Group Holding Ltd (NYSE:BABA) and JD.Com Inc (NASDAQ:JD) are both lower Tuesday, as Chinese markets return to trading after the Golden Week holiday. Stocks in the region are underperforming after China's National Development and Reform Commission (NDRC) Chair Zheng Shanjie pledged actions to bolster the country's domestic economy, but stopped short of revealing any new economic stimulus plans.At last glance, Alibaba stock is 7.2% lower at $109.1 ...